I'd like to request that you add Battle Race and Boost Race to the Singleplayer Career. I'm aware there's some tracks that support the modes in World Tour, but not all of them. It should be easy enough to add them, take the code from the Local Multiplayer screen, cut out the Battle Arena and Capture the Chao modes. And that should be all.

Now when players select Single Race in Career, there will be 3 options; Standard Race, Battle Race and Boost Race.

Thanks for reading, I really hope you'll take this request into consideration for a future patch.

It would be fantastic if local custom games could simply be played with one player, instead of requiring two or more. This would solve this issue and, even though there's no AI support for Arena, at least allow players to explore the arenas on their own (I guess? Doesn't hurt)